Grinding apparatus



,wy 22, 1924. LSZ

B. M. ELY

.GR INDING APPARATUS Filed May 3, 1923 INVEN'TOR f W EL? BY HM fr V A TTURNEYS.

Patented July 22, 1924.

UNETED STATES PATENTE OFFICE.

BERNARD IVI. ELY, OF TROY, OVI-IIO.

GRINDING APPARATUS.

Application led May 3,

. T all whom it may concern.'

. and useful Improvements in Grinding Apparatus, of which the following is Va full, clear, and exact description.

This invention relates to an improved form of chopping or grinding apparatus.

One of the principal objects of the invention is to provide an improved form of apparatus for grinding` meat, and the like, which is efcient inits operation, simple in construction, easy of assembly, and long lived.

Another object of the invention is to provide an improved form of knife and plate construction yfor Ause in apparatus of this character.

' Other objects andadvantages of the invention will be apparent from the description set out below when taken in connection with the accompanying drawing.

In the drawing, in which like characters of reference designate like parts throughout the several` views thereof;

Fig. 1 is a side elevation of a meat choppervor grinder, constructed in accordance with this invention, certain parts thereof being shown in section to more clearly disclose theV invention; .j

Fig. 2 is a sideV elevation of one element of the invention; and

Fig. 3 is an end view of the worm forming a part of the meat grinder.

This meat grinder comprises a chopper vcylinderl 10, which is adapted to receive the meat,` or other material to be ground. Mounted in this chopper cylinder is a worm .Y 11, one` end of `which is provided with a shaftiwhich is suitably j ournaled within the bearing 12, which also acts to receive the thrust -of the shaft during operation, the

` freer ,outer endof vthe shaft being provided with attened faces as showny at 13, to receive an operating handle, notv shown, by means of which the worm may be rotated to force the meat, or other material, along ,the chopper cylinder.

The other end of the chop-per cylinder is closed by means of a removable, perforated, plate 15, which seats within a recess 16, in the end ofthe chopper cylinder; being held firmly against the shoulder 17, by means of a retaining ring or sleeve 18, which is 1923. Serial N0. 636,405.

threadedly mounted on the chopper cylinder, a hand wheel 19 being provided for rotating the sleeve 18 to permit removal of the plate 15, or to clamp that plate tightly in operative position.

The plate 15 is provided, centrally, with an opening surrounded by an outwardly eX- tending hollow-boss 25,the plate and boss thus having a .passage 26 extending therethrough, which passage is adapted to receive the stud 27. The inner end of this stud has flattened faces, as shown most clearly :in Fig. 2, this inner end of the stud being pref? erably substantially square in cross section. This inner end of the stud is also provided with a circular flange or rib 30, which divides the squared end of the stu'dinto two parts 31 and 32. The part 31 is adapted to receive the knife 35, which is provided with a square hole or passage therethrough, a driving connection thus being secured between the stud and knife when the knife is mounted in position. The portion 32 of the squared end of the stud, when the device is in operative position, extends into a squared socket within the cooperating end ofthe worm 11, driving connection thus being established between the worm and the stud, and the knife carried kby the stud. f

The worm 11 is preferably pro-vided with a 1' cylindrical socket 37, as shown most clearly in Fig. 3, which is internally threaded, and which has threadedly mounted therein a sleeve 38, having a squared passage 39 therethrough adapted to receive thel squared portion 32 of the stud. .As shown in Figs. l and 3 the sleeve 38 is also recessed to receive the flange 30, this recess being designated by the numeral 40.

,l The proportion of the squared passage 39 and the portion 32 of the stud are such that the studA end 'is readily slidable within this passagev to? permit assembling or disassemblingof the device, there being no positive connectionbetweenthe stud andthe worm at all. l

VIn order to' secure the desired adjustment of the knife relative to the plate 15 the out-er end of the stud 27 is. threaded and has threadedly v mounted thereon van adjusting nut 45, withl which is associated a cooperatllO the knife and plate constitute a selfcontained unit and all the thrusts incident to the cut ting operation are held within this unit. There will be, during operation, no thrust on the bearing at the back end ot the Worm except that due to the feeding forward ot' the meat. And consequently there is no Wear on the bearing 12 at the back of the Worm when the Worm is running idle, and very little when the device is operating to grind meat. V

Meats generally contain considerable percentage of very tough sinews. These are so tough, in tact, that when they protrude through the holes in the plate 15 and the knife comes into conta-ctl With them, the knife will tend to slide over the sineivs instead ot cutting them. ln grinders of the types heretofore used this action Will actually take place, the knife and perforated plate being forced apart to provide space for these tough sinewvs. This space is secured by a combination of stretching of the cylinder and compression of the Worm 11 together with Athe taking up ot slack in the threads on the hand Wheel 18, the slack between the knii'fe and plate and the slack between the thrust end of the cylinder andthe Worm.

But in the device of this invention, as shown, the only stretching thatcan occur is that in the stud 27 so that theaction becomes in effect the action of a pair of scissors in which the blades are adjusted tightly against each other. This action results in the clean cutting of the sinews and also prevents clogging oi the holes in the plate by reason of their filling up With uncut sinews.

in the device ot this invention a further advantage is obtained in that the pressure between the knife and plate may be materially decreased as compared with the standard construction heretofore used. This -re suits in less wear on the knife and plate and also on the rear thrust bearing and also makes tor economy in power in operating the chopper as a Whole.

By removing the retaining ring 18, through proper manipulation of the hand Wheel 19, the plate and knife 35 may be removed` as a unit, Whenever this is desired.

ln order to prevent rotation of the plate, during operation, one edge of the plate is provided With a. notch which is adapted to receive the end of a locking pin which is mounted in a 'suitablepafssage 51, in the body ot the chopper cylinder.

While the form of apparatus herein described constitutes a "preferred embodiment ot the invention, it is to be undersotod that the invention is not limited to this precise tor-m of apparatus, and that changes Vmay be made therein Without departing from the scope of the invention 'which is vdefined in the appended claims.

That is claimed is:

,1. In a grinding device of the character described, a chopper cylinder; a Worm therein; a fiatperforated plate positioned at one end of said cylinder, having an opening therein; a stud mounted in said opening, a knife removably mounted on one end oi said stud, and means carried by said stud and independent of said Worm tor varying the positioning of the plate and knife relative to each other.

ln grinding device ot' the character described, a chopper cylinder; a Worm therein; a perforated plate positioned at one end ot said cylinder, and having an opening therein, a forwardly extending hollow boss surrounding said opening; a stud mounted Within. said opening and boss, a knife carried by said stud in driving relation therewith the end of said stud Which entends through said boss being threaded, and an adjusting nut threadedlymounted upon the said stud, in cooperative relation With the aid boss.

8. In a grinding device ot the character described, .a chopper cylinder; a Worm therein, having Ctmight Walled socket in one end ther-ect; a grinding unit comprising a knife positioned in the end of said chop per cylinder, means independent of said vorm tor maintaining said knite lin position, and a driving extension removably associated with said knife extending into the socket in the said Worm,

4. Tira grinding device of the character described, a chopper cylinder; a Worin in said cylinder having a straight Walled socket in one end thereof; a plate positioned in one end of said cylinder, and having an opening therein, detachable means for holding said plate in said chopper cylinder; a stud mount-ed in the opening in said plate, having a squared end positioned in the socket ot the said Worm, this construction eitecting a driving connect-'ion between the Worm and the stud, a knife mounted on said stud, means for adjusting the stud and 'the knife carried thereby relative 'to ,the pla-te, independent or". the adjustment oi' vthe said Worin; the construction being such that the plate, stud, Vand knife may be removed as a unit.

5. `In a grinding device of the character described, a chopper cylinder, threaded at one end; a Worm mounted in said cylinder, and Vhaving a threaded vsocket in 'one 'end thereof, a threaded sleeve, Ahaving a squared passage therethrough vthreadsdiy mounted Within the said socket; a plate 'positioned against the end of "the cylinder, yhaving a centrally arranged opening therein, :a cooperating retaining 'r-ing threadedly mount ed on the threaded end of the said chopper cylinder to hold said plate in position; a 'forwardly extending boss surrounding the opening in the said plate, a st nd mounted in the said opening, therinneluefnd of which is squared, a knife, having a squared passage therethrough, positioned on fthe squared end v Yof the stud, a retaining flange on the stud,

means carried by said stud 'and cooperating with the plate for clamping: the knife between the plate and the retaining flange, and a squared extension on the efnd of the said 10 stud, beyond the said retaining flange, eX-

effect driving connection between the said Worm and the said stud.

In testimonyffwhereof I hereto aHiX my 15 sgnatlire.

BERNARD M. ELY.

Witness J. E. AQNA. 

